HCCI

TIAX’s patented control system for engines running in Homogenous Charge Compression Ignition (HCCI) or mixed-mode enables ultra-low emissions with up to a 15% improvement in efficiency over today’s engines.

TIAX’s control system controls combustion through indirect means by using a predictive model. Control modes can be optimized for response time, efficiency, or emissions, among other outputs.

HCCI engines have been a focus of Internal Combustion Engine (ICE) research recently primarily because, with lean fuel/air mixtures, they can obtain higher thermal efficiency compared to the conventional Spark Ignition (SI) engines and significantly lower NOx and soot emissions than conventional Compression Ignition (CI) engines. HCCI could be fuel-neutral or fuel-flexible. It also has the potential to unify all the ICE technology to achieve the high-efficiency, low-emission goal; however, these advantages do not come easy. Problems encountered with HCCI combustion center on the difficulty in control, e.g., controlling the start of combustion, rate of heat release, mitigating hydrocarbon (HC) and carbon monoxide (CO) emissions, improving the power density, and controlling the transition in and out of HCCI modes.

 

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